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I've seen a lot of people complaining about Kairi being kidnapped again and not accomplishing much in KH3. Honestly, I never expected anything else from her. In fact, I would have been suprised if she wasn't kidnapped. The only suprising part for me was that Xehanort killed her.
I mean, Kairi is basically Square Enix's version of a Disney princess. She's meant to be compared to them. They're always getting kidnapped, or stumbling into danger, or otherwise having some large problem their true love has to help them with. Their prince is defined by their efforts to save them. Aladdin showed Jasmine a whole new world, and saved her from marrying Jafar. Eric saved Ariel from Ursula, and, well, showed her a whole new world. Prince Kit (Charming) searched the kingdom for Cinderella, and saved her from her wicked stepmother and ugly stepsisters. Prince Phillip literally fought a dragon and woke Aurora from an eternal sleep. Kairi's no different. She lost her heart, and entrusted it to Sora, who brought it back to her. She was always written to be Sora's princess, and that theme has been constant.
Besides, her role, and what happened to her was tragically poetic, and beautifully so. The whole series, Sora's whole journey started with finding and saving her. KH1 and 2 mirror and build up to this as well. After Sora finds and saves Kairi in KH1, she in turn saves him from being a heartless. In KH2, she goes looking for him, even though she doesn't remember who he is, and by doing this, she ends up reuniting him with Riku again. In KH3, she joins the fight, she's the only one who survived the demon tide the first time, and she led Sora back to the Realm of light, and the living. Then, she was kidnapped again. Xehanort killed her to forge the X-blade, and in the end, Sora gave his life to bring her back. Now she's left alone, and it's her turn again to save him. Even Sora commented on this. This whole journey was about saving her, and it's not over until they're together again.
It's not that Kairi's weak and can't stand up for herself, or that Nomura wrote her poorly. She's extremely well written. She's the light that Sora needs to protect. Saving the universe three times was a happy accident. It was never about saving the worlds, it was about saving his. She defines Sora in a way that no adventure, power, or responsibility ever could.

I have a theory of what's in the box that the Master of Masters was dragging. I think it might be the 13 pieces of darkness of the shattered χ-blade. The χ-blade shattered into 20 pieces: 13 of darkness and 7 of light. We know that it broke into 7 pieces of light in order to protect the hearts of the Seven Princesses of Heart, but we don't know exactly what that means. Especially considering the Seven Princesses of Heart weren't alive way back then. But maybe it means that the χ-blade shattered into 7 pieces of light which would then become the Seven Princess of Heart's hearts in the future?
Also, we were never told what happened to the 13 pieces of darkness.
If a heart of pure darkness and a heart of pure light clash, then the χ-blade is recreated, but it is unstable. In DDD, it is revealed that Xehanort plans on capturing the Seven Princesses again so that they can clash with the 13 Seekers of Darkness to recreate the χ-blade. But, how can this be? The 13 Seekers of Darkness don't have hearts of pure darkness, so how would them clashing with the pure-hearted princesses recreate the χ-blade? I think I might know the answer.
I believe that Xehanort wants to find that case that the Master of Masters has or maybe he already has it. If the 13 pieces of darkness from the shattered χ-blade are in that case, then Xehanort can take them and put them into each of the 13 Seekers of Darkness' hearts to turn them into hearts of pure darkness. Then, he can clash with the Princesses of Heart to recreate the χ-blade, but this time, a much more stable one. It'd actually pretty much be the original χ-blade because it'd be created from the original shattered pieces.
So yeah, what do you think of this theory? Anything I could add to it?

Do you think the Princesses of Heart could be the Key to Return Hearts? We don't know exactly what it is, but judging by it's name, it has the ability to return someone's heart, whatever that means. This reminds me of the time in KH1 when Kairi hugged Sora's Heartless and was able to bring him back to his regular self. One could say she "returned his heart" back to normal. Nomura said she was able to do this because she has special Princess of Heart light powers.
So, maybe the Princesses of Heart can be used to create some kind of Keyblade, like how their hearts were used to create the Keyblade of heart? Maybe the Keyblade of heart is the Key to Return Hearts? It never got an official name, so maybe that's it's official name? The whole thing that made the Keyblade of heart special was that it had the ability to unlock people's hearts, but later in the series, we discover that Keyblade Masters have the ability to unlock hearts, so that makes the Keyblade of heart not seem special anymore. It's sort of special because it allows people who aren't Keyblade Masters to unlock people's hearts, but that isn't really that special or impressive. So maybe the true purpose of the Keyblade of heart is that it can also return people who have succumbed to the darkness back to their original selves? Or maybe it can just "return hearts" in general, which means it can do loads of things? Like being able to make Ven's heart return to his body for example.
EDIT: The Keyblade of heart is also special because it also acted as the χ-blade to Ansem, Seeker of Darkness' artificial Kingdom Hearts.

These are the following worlds that are more than likely to appear in KH3 whether in the form of a cut scene, Tutorial or as an actual world:
- Destiny Islands - As a cut scene or an entire world.
Destiny islands is likely to appear in KH3 assuming that is where the journey starts for Sora, if we are not able to play through the island and mainland it will probably be shown in cut scenes instead like KH2.
- Twilight Town - As a world.
The only things that confirm Twilight Town might be returning are the early KH3 trailers, and the fact it has huge ties with the characters Lea, Xion and Roxas.
- Keyblade Graveyard - Final Battle/World.
It is more than likely that the Final Battle will take place on this world just as the original Keyblade War did.
- Princess worlds - Worlds and cut scenes.
There are guardians of Light for each of the princesses. Seeing as 7 lights and 13 darkness’s will clash, Xehanort will go after the 7 princesses of light if not the guardians so obviously the guardians would need to go to their world to protect them. If some of the worlds are not playable then there should be cut scenes kind of like KH1.
- Shibuya - As a World.
The only thing that confirms this is the conversation with Neku, when he says Sora should visit them. If not then it COULD be a world in the future of Kingdom Hearts
- Hollow Bastion/Radiant Garden - As a world.
I really can’t think of a reason. But I know there is one. (I got lazy with the post at this point)
- Castle Oblivion/Land of Departure - As a world or cut scene.
To get Ventus. That’s about it.
- Mysterious Tower - As a world or cut scene.
Seeing as Lea and Kairi are training there, it will either be a tutorial world or cut scenes showing them training.
- Olympus Coliseum – As a world or cut scene.
The Rock titan boss in the KH3 trailer. That’s about the only reason. (I'd rather not have it in KH3).
EDIT: Like others said, the Realm of Darkness could also appear due to aqua being stuck there.